Bring those Womps out Monday! I cut down a couple sets of tires yesterday to meet spec. and installed them on my Womp (yes I actually worked on a car yesterday!). This car is my test mule.
The car has a Professor Motor 25K fk can motor https://www.professormotor.com/Fox-10-M … tr1032.htm . I am using a 7 tooth pinion, and started out with a 28 tooth crown. With the urethane tires on the car I ran a best lap time of 6.086.
I replaced the urethane tires with a pair of used natural rubber tires I narrowed to the class spec of .600", and cut down to .790" diameter. A note here: if you are running a crown gear larger than 28 tooth, you will not pass tech for ground clearance with .790" tires. With the natural rubber tires I was able to run a best time of 5.763.
I replaced the 28 tooth crown gear with a 27 tooth. I was able to lower my best time to a 5.511, and the motor still ran without over heating.
I then modified the front axle making the front wheels/tires rotate independently. My best time was lowered to 5.496.
Lastly I narrowed/lightened the rear axle and dropped my best time again to 5.463. All of this took place over 181 laps of testing. The net result is a car I can run average laps around the 5.6 to 5.7 mark.
Today I plan to spend some time cutting tires so I can have a few sets on hand at Monday's open track. The old natural rubber tires that are no longer good for the 1/24 cars we run seem to work very well on the Womps once they are cut down and narrowed.